finding and deleting flash cookies in OSX Yosemite

Hello,

I use Safari or FireFox as a browser. Recently I read a lot about the so-called LSO's or Flash cookies.

Where are they stored on my Mac, how can I find and delete them, and is it possible to prevent them from being installed on my computer ? Do I need root privileges for that ?

I have been looking for a directory called :

~/Library/Preferences/Macromedia/Flash Player/#SharedObjects

and

~/Library/Preferences/Macromedia/Flash Player/macromedia.com/support/flashplayer/sys/

but I can't find them. Either a) they do not exist, or b) I have no right to see them.

In my Safari Preferences, I allow cookies from the sites I visit, and I deny websites using my location.

From time to time, if I do not forget, I empty my cache.

I have Java-script enabled, and allow some web-site plugins, like Silverlight, Java, Quicktime, WebEx 64, Google Earth.

Any help will be greatly appreciated,

WB